src/scene-effect-2d.cpp - people/jessebarker/glmark2 - Git at Google

 /*
  * Copyright © 2010-2011 Linaro Limited
  *
  * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
  *
  * glmark2 is free software: you can redistribute it and/or modify it under the
  * terms of the GNU General Public License as published by the Free Software
  * Foundation, either version 3 of the License, or (at your option) any later
  * version.
  *
  * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  * details.
  *
  * You should have received a copy of the GNU General Public License along with
  * glmark2.  If not, see <http://www.gnu.org/licenses/>.
  *
  * Authors:
  *  Alexandros Frantzis (glmark2)
  */
 #include <cmath>
 #include <climits>
 #include <numeric>

 #include "scene.h"
 #include "mat.h"
 #include "stack.h"
 #include "vec.h"
 #include "log.h"
 #include "program.h"
 #include "shader-source.h"
 #include "util.h"


 SceneEffect2D::SceneEffect2D(Canvas &pCanvas) :
     Scene(pCanvas, "effect2d")
 {
     options_["kernel"] = Scene::Option("kernel",
         "0,0,0;0,1,0;0,0,0",
         "The convolution kernel matrix to use [format: \"a,b,c...;d,e,f...\"");;
     options_["normalize"] = Scene::Option("normalize", "true",
         "Whether to normalize the supplied convolution kernel matrix [true,false]");
 }

 SceneEffect2D::~SceneEffect2D()
 {
 }

 /*
  * Calculates the offset of the coefficient with index i
  * from the center of the kernel matrix. Note that we are
  * using the standard OpenGL texture coordinate system
  * (x grows rightwards, y grows upwards).
  */
 static LibMatrix::vec2
 calc_offset(unsigned int i, unsigned int width, unsigned int height)
 {
     int x = i % width - (width - 1) / 2;
     int y = -(i / width - (height - 1) / 2);

     return LibMatrix::vec2(static_cast<float>(x),
                            static_cast<float>(y));

 }

 /**
  * Creates a fragment shader implementing 2D image convolution.
  *
  * In the mathematical definition of 2D convolution, the kernel/filter (2D
  * impulse response) is essentially mirrored in both directions (that is,
  * rotated 180 degrees) when being applied on a 2D block of data (eg pixels).
  *
  * Most image manipulation programs, however, use the term kernel/filter to
  * describe a 180 degree rotation of the 2D impulse response. This is more
  * intuitive from a human understanding perspective because this rotated matrix
  * can be regarded as a stencil that can be directly applied by just "placing"
  * it on the image.
  *
  * In order to be compatible with image manipulation programs, we will
  * use the same definition of kernel/filter (180 degree rotation of impulse
  * response). This also means that we don't need to perform the (implicit)
  * rotation of the kernel in our convolution implementation.
  *
  * @param canvas the destination Canvas for this shader
  * @param array the array holding the filter coefficients in row-major
  *              order
  * @param width the width of the filter
  * @param width the height of the filter
  *
  * @return a string containing the frament source code
  */
 static std::string
 create_convolution_fragment_shader(Canvas &canvas, std::vector<float> &array,
                                    unsigned int width, unsigned int height)
 {
     static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/effect-2d-convolution.frag");
     ShaderSource source(frg_shader_filename);

     if (width * height != array.size()) {
         Log::error("Convolution filter size doesn't match supplied dimensions\n");
         return "";
     }

     /* Steps are needed to be able to access nearby pixels */
     source.add_const("TextureStepX", 1.0f/canvas.width());
     source.add_const("TextureStepY", 1.0f/canvas.height());

     std::stringstream ss_def;
     std::stringstream ss_convolution;

     /* Set up stringstream floating point options */
     ss_def << std::fixed;
     ss_convolution.precision(1);
     ss_convolution << std::fixed;

     ss_convolution << "result = ";

     for(std::vector<float>::const_iterator iter = array.begin();
         iter != array.end();
         iter++)
     {
         unsigned int i = iter - array.begin();

         /* Add Filter coefficient const definitions */
         ss_def << "const float Kernel" << i << " = "
                << *iter << ";" << std::endl;

         /* Add convolution term using the current filter coefficient */
         LibMatrix::vec2 offset(calc_offset(i, width, height));
         ss_convolution << "texture2D(Texture0, TextureCoord + vec2("
                        << offset.x() << " * TextureStepX, "
                        << offset.y() << " * TextureStepY)) * Kernel" << i;
         if (iter + 1 != array.end())
             ss_convolution << " +" << std::endl;
     }

     ss_convolution << ";" << std::endl;

     source.add(ss_def.str());
     source.replace("$CONVOLUTION$", ss_convolution.str());

     return source.str();
 }

 /**
  * Creates a string containing a printout of a kernel matrix.
  *
  * @param filter the vector containing the filter coefficients
  * @param width the width of the filter
  *
  * @return the printout
  */
 static std::string
 kernel_printout(const std::vector<float> &kernel,
                 unsigned int width)
 {
     std::stringstream ss;
     ss << std::fixed;

     for (std::vector<float>::const_iterator iter = kernel.begin();
          iter != kernel.end();
          iter++)
     {
         ss << *iter << " ";
         if ((iter - kernel.begin()) % width == width - 1)
             ss << std::endl;
     }

     return ss.str();
 }

 /**
  * Parses a string representation of a matrix and returns it
  * in row-major format.
  *
  * In the string representation, elements are delimited using
  * commas (',') and rows are delimited using semi-colons (';').
  * eg 0,0,0;0,1.0,0;0,0,0
  *
  * @param str the matrix string representation to parse
  * @param matrix the float vector to populate
  * @param[out] width the width of the matrix
  * @param[out] height the height of the matrix
  *
  * @return whether parsing succeeded
  */
 static bool
 parse_matrix(std::string &str, std::vector<float> &matrix,
              unsigned int &width, unsigned int &height)
 {
     std::vector<std::string> rows;
     unsigned int w = UINT_MAX;

     Util::split(str, ';', rows);

     Log::debug("Parsing kernel matrix:\n");

     for (std::vector<std::string>::const_iterator iter = rows.begin();
          iter != rows.end();
          iter++)
     {
         std::vector<std::string> elems;
         Util::split(*iter, ',', elems);

         if (w != UINT_MAX && elems.size() != w) {
             Log::error("Matrix row %u contains %u elements, whereas previous"
                        " rows had %u\n",
                        iter - rows.begin(), elems.size(), w);
             return false;
         }

         w = elems.size();

         for (std::vector<std::string>::const_iterator iter_el = elems.begin();
              iter_el != elems.end();
              iter_el++)
         {
             float f(Util::fromString<float>(*iter_el));
             matrix.push_back(f);
             Log::debug("%f ", f);
         }

         Log::debug("\n");
     }

     width = w;
     height = rows.size();

     return true;
 }

 /**
  * Normalizes a convolution kernel matrix.
  *
  * @param filter the filter to normalize
  */
 static void
 normalize(std::vector<float> &kernel)
 {
     float sum = std::accumulate(kernel.begin(), kernel.end(), 0.0);

     /*
      * If sum is essentially zero, perform a zero-sum normalization.
      * This normalizes positive and negative values separately,
      */
     if (fabs(sum) < 0.00000001) {
         sum = 0.0;
         for (std::vector<float>::iterator iter = kernel.begin();
              iter != kernel.end();
              iter++)
         {
             if (*iter > 0.0)
                 sum += *iter;
         }
     }

     /*
      * We can simply compare with 0.0f here, because we just care about
      * avoiding division-by-zero.
      */
     if (sum == 0.0)
         return;

     for (std::vector<float>::iterator iter = kernel.begin();
          iter != kernel.end();
          iter++)
     {
         *iter /= sum;
     }

 }

 int
 SceneEffect2D::load()
 {
     Texture::load(GLMARK_DATA_PATH"/textures/effect-2d.png", &texture_,
                   GL_NEAREST, GL_NEAREST, 0);
     running_ = false;

     return 1;
 }

 void
 SceneEffect2D::unload()
 {
     glDeleteTextures(1, &texture_);
 }

 void
 SceneEffect2D::setup()
 {
     Scene::setup();

     static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/effect-2d.vert");

     std::vector<float> kernel;
     unsigned int kernel_width = 0;
     unsigned int kernel_height = 0;

     /* Parse the kernel matrix from the options */
     if (!parse_matrix(options_["kernel"].value, kernel,
                       kernel_width, kernel_height))
     {
         return;
     }

     /* Normalize the kernel matrix if needed */
     if (options_["normalize"].value == "true") {
         normalize(kernel);
         Log::debug("Normalized kernel matrix:\n%s",
                    kernel_printout(kernel, kernel_width).c_str());
     }

     /* Create and load the shaders */
     ShaderSource vtx_source(vtx_shader_filename);
     ShaderSource frg_source;
     frg_source.append(create_convolution_fragment_shader(canvas_, kernel,
                                                          kernel_width,
                                                          kernel_height));

     if (frg_source.str().empty())
         return;

     if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
                                           frg_source.str()))
     {
         return;
     }

     std::vector<int> vertex_format;
     vertex_format.push_back(3);
     mesh_.set_vertex_format(vertex_format);

     mesh_.make_grid(1, 1, 2.0, 2.0, 0.0);
     mesh_.build_vbo();

     std::vector<GLint> attrib_locations;
     attrib_locations.push_back(program_["position"].location());
     mesh_.set_attrib_locations(attrib_locations);

     program_.start();

     // Load texture sampler value
     program_["Texture0"] = 0;

     currentFrame_ = 0;
     running_ = true;
     startTime_ = Scene::get_timestamp_us() / 1000000.0;
     lastUpdateTime_ = startTime_;
 }

 void
 SceneEffect2D::teardown()
 {
     mesh_.reset();

     program_.stop();
     program_.release();

     Scene::teardown();
 }

 void
 SceneEffect2D::update()
 {
     double current_time = Scene::get_timestamp_us() / 1000000.0;
     double elapsed_time = current_time - startTime_;

     lastUpdateTime_ = current_time;

     if (elapsed_time >= duration_) {
         averageFPS_ = currentFrame_ / elapsed_time;
         running_ = false;
     }

     currentFrame_++;
 }

 void
 SceneEffect2D::draw()
 {
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_2D, texture_);

     mesh_.render_vbo();
 }

 Scene::ValidationResult
 SceneEffect2D::validate()
 {
     return ValidationUnknown;
 }
	/*
	* Copyright © 2010-2011 Linaro Limited
	*
	* This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
	*
	* glmark2 is free software: you can redistribute it and/or modify it under the
	* terms of the GNU General Public License as published by the Free Software
	* Foundation, either version 3 of the License, or (at your option) any later
	* version.
	*
	* glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
	* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
	* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
	* details.
	*
	* You should have received a copy of the GNU General Public License along with
	* glmark2. If not, see <http://www.gnu.org/licenses/>.
	*
	* Authors:
	* Alexandros Frantzis (glmark2)
	*/
	#include <cmath>
	#include <climits>
	#include <numeric>

	#include "scene.h"
	#include "mat.h"
	#include "stack.h"
	#include "vec.h"
	#include "log.h"
	#include "program.h"
	#include "shader-source.h"
	#include "util.h"


	SceneEffect2D::SceneEffect2D(Canvas &pCanvas) :
	Scene(pCanvas, "effect2d")
	{
	options_["kernel"] = Scene::Option("kernel",
	"0,0,0;0,1,0;0,0,0",
	"The convolution kernel matrix to use [format: \"a,b,c...;d,e,f...\"");;
	options_["normalize"] = Scene::Option("normalize", "true",
	"Whether to normalize the supplied convolution kernel matrix [true,false]");
	}

	SceneEffect2D::~SceneEffect2D()
	{
	}

	/*
	* Calculates the offset of the coefficient with index i
	* from the center of the kernel matrix. Note that we are
	* using the standard OpenGL texture coordinate system
	* (x grows rightwards, y grows upwards).
	*/
	static LibMatrix::vec2
	calc_offset(unsigned int i, unsigned int width, unsigned int height)
	{
	int x = i % width - (width - 1) / 2;
	int y = -(i / width - (height - 1) / 2);

	return LibMatrix::vec2(static_cast<float>(x),
	static_cast<float>(y));

	}

	/**
	* Creates a fragment shader implementing 2D image convolution.
	*
	* In the mathematical definition of 2D convolution, the kernel/filter (2D
	* impulse response) is essentially mirrored in both directions (that is,
	* rotated 180 degrees) when being applied on a 2D block of data (eg pixels).
	*
	* Most image manipulation programs, however, use the term kernel/filter to
	* describe a 180 degree rotation of the 2D impulse response. This is more
	* intuitive from a human understanding perspective because this rotated matrix
	* can be regarded as a stencil that can be directly applied by just "placing"
	* it on the image.
	*
	* In order to be compatible with image manipulation programs, we will
	* use the same definition of kernel/filter (180 degree rotation of impulse
	* response). This also means that we don't need to perform the (implicit)
	* rotation of the kernel in our convolution implementation.
	*
	* @param canvas the destination Canvas for this shader
	* @param array the array holding the filter coefficients in row-major
	* order
	* @param width the width of the filter
	* @param width the height of the filter
	*
	* @return a string containing the frament source code
	*/
	static std::string
	create_convolution_fragment_shader(Canvas &canvas, std::vector<float> &array,
	unsigned int width, unsigned int height)
	{
	static const std::string frg_shader_filename(GLMARK_DATA_PATH"/shaders/effect-2d-convolution.frag");
	ShaderSource source(frg_shader_filename);

	if (width * height != array.size()) {
	Log::error("Convolution filter size doesn't match supplied dimensions\n");
	return "";
	}

	/* Steps are needed to be able to access nearby pixels */
	source.add_const("TextureStepX", 1.0f/canvas.width());
	source.add_const("TextureStepY", 1.0f/canvas.height());

	std::stringstream ss_def;
	std::stringstream ss_convolution;

	/* Set up stringstream floating point options */
	ss_def << std::fixed;
	ss_convolution.precision(1);
	ss_convolution << std::fixed;

	ss_convolution << "result = ";

	for(std::vector<float>::const_iterator iter = array.begin();
	iter != array.end();
	iter++)
	{
	unsigned int i = iter - array.begin();

	/* Add Filter coefficient const definitions */
	ss_def << "const float Kernel" << i << " = "
	<< *iter << ";" << std::endl;

	/* Add convolution term using the current filter coefficient */
	LibMatrix::vec2 offset(calc_offset(i, width, height));
	ss_convolution << "texture2D(Texture0, TextureCoord + vec2("
	<< offset.x() << " * TextureStepX, "
	<< offset.y() << " * TextureStepY)) * Kernel" << i;
	if (iter + 1 != array.end())
	ss_convolution << " +" << std::endl;
	}

	ss_convolution << ";" << std::endl;

	source.add(ss_def.str());
	source.replace("$CONVOLUTION$", ss_convolution.str());

	return source.str();
	}

	/**
	* Creates a string containing a printout of a kernel matrix.
	*
	* @param filter the vector containing the filter coefficients
	* @param width the width of the filter
	*
	* @return the printout
	*/
	static std::string
	kernel_printout(const std::vector<float> &kernel,
	unsigned int width)
	{
	std::stringstream ss;
	ss << std::fixed;

	for (std::vector<float>::const_iterator iter = kernel.begin();
	iter != kernel.end();
	iter++)
	{
	ss << *iter << " ";
	if ((iter - kernel.begin()) % width == width - 1)
	ss << std::endl;
	}

	return ss.str();
	}

	/**
	* Parses a string representation of a matrix and returns it
	* in row-major format.
	*
	* In the string representation, elements are delimited using
	* commas (',') and rows are delimited using semi-colons (';').
	* eg 0,0,0;0,1.0,0;0,0,0
	*
	* @param str the matrix string representation to parse
	* @param matrix the float vector to populate
	* @param[out] width the width of the matrix
	* @param[out] height the height of the matrix
	*
	* @return whether parsing succeeded
	*/
	static bool
	parse_matrix(std::string &str, std::vector<float> &matrix,
	unsigned int &width, unsigned int &height)
	{
	std::vector<std::string> rows;
	unsigned int w = UINT_MAX;

	Util::split(str, ';', rows);

	Log::debug("Parsing kernel matrix:\n");

	for (std::vector<std::string>::const_iterator iter = rows.begin();
	iter != rows.end();
	iter++)
	{
	std::vector<std::string> elems;
	Util::split(*iter, ',', elems);

	if (w != UINT_MAX && elems.size() != w) {
	Log::error("Matrix row %u contains %u elements, whereas previous"
	" rows had %u\n",
	iter - rows.begin(), elems.size(), w);
	return false;
	}

	w = elems.size();

	for (std::vector<std::string>::const_iterator iter_el = elems.begin();
	iter_el != elems.end();
	iter_el++)
	{
	float f(Util::fromString<float>(*iter_el));
	matrix.push_back(f);
	Log::debug("%f ", f);
	}

	Log::debug("\n");
	}

	width = w;
	height = rows.size();

	return true;
	}

	/**
	* Normalizes a convolution kernel matrix.
	*
	* @param filter the filter to normalize
	*/
	static void
	normalize(std::vector<float> &kernel)
	{
	float sum = std::accumulate(kernel.begin(), kernel.end(), 0.0);

	/*
	* If sum is essentially zero, perform a zero-sum normalization.
	* This normalizes positive and negative values separately,
	*/
	if (fabs(sum) < 0.00000001) {
	sum = 0.0;
	for (std::vector<float>::iterator iter = kernel.begin();
	iter != kernel.end();
	iter++)
	{
	if (*iter > 0.0)
	sum += *iter;
	}
	}

	/*
	* We can simply compare with 0.0f here, because we just care about
	* avoiding division-by-zero.
	*/
	if (sum == 0.0)
	return;

	for (std::vector<float>::iterator iter = kernel.begin();
	iter != kernel.end();
	iter++)
	{
	*iter /= sum;
	}

	}

	int
	SceneEffect2D::load()
	{
	Texture::load(GLMARK_DATA_PATH"/textures/effect-2d.png", &texture_,
	GL_NEAREST, GL_NEAREST, 0);
	running_ = false;

	return 1;
	}

	void
	SceneEffect2D::unload()
	{
	glDeleteTextures(1, &texture_);
	}

	void
	SceneEffect2D::setup()
	{
	Scene::setup();

	static const std::string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/effect-2d.vert");

	std::vector<float> kernel;
	unsigned int kernel_width = 0;
	unsigned int kernel_height = 0;

	/* Parse the kernel matrix from the options */
	if (!parse_matrix(options_["kernel"].value, kernel,
	kernel_width, kernel_height))
	{
	return;
	}

	/* Normalize the kernel matrix if needed */
	if (options_["normalize"].value == "true") {
	normalize(kernel);
	Log::debug("Normalized kernel matrix:\n%s",
	kernel_printout(kernel, kernel_width).c_str());
	}

	/* Create and load the shaders */
	ShaderSource vtx_source(vtx_shader_filename);
	ShaderSource frg_source;
	frg_source.append(create_convolution_fragment_shader(canvas_, kernel,
	kernel_width,
	kernel_height));

	if (frg_source.str().empty())
	return;

	if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
	frg_source.str()))
	{
	return;
	}

	std::vector<int> vertex_format;
	vertex_format.push_back(3);
	mesh_.set_vertex_format(vertex_format);

	mesh_.make_grid(1, 1, 2.0, 2.0, 0.0);
	mesh_.build_vbo();

	std::vector<GLint> attrib_locations;
	attrib_locations.push_back(program_["position"].location());
	mesh_.set_attrib_locations(attrib_locations);

	program_.start();

	// Load texture sampler value
	program_["Texture0"] = 0;

	currentFrame_ = 0;
	running_ = true;
	startTime_ = Scene::get_timestamp_us() / 1000000.0;
	lastUpdateTime_ = startTime_;
	}

	void
	SceneEffect2D::teardown()
	{
	mesh_.reset();

	program_.stop();
	program_.release();

	Scene::teardown();
	}

	void
	SceneEffect2D::update()
	{
	double current_time = Scene::get_timestamp_us() / 1000000.0;
	double elapsed_time = current_time - startTime_;

	lastUpdateTime_ = current_time;

	if (elapsed_time >= duration_) {
	averageFPS_ = currentFrame_ / elapsed_time;
	running_ = false;
	}

	currentFrame_++;
	}

	void
	SceneEffect2D::draw()
	{
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, texture_);

	mesh_.render_vbo();
	}

	Scene::ValidationResult
	SceneEffect2D::validate()
	{
	return ValidationUnknown;
	}